They may be hibernating, which happens during cold months in temperate regions, but often relates to rainy seasons in tropical or arid regions.

If you enjoy my expertise and identifications, please do not put wild populations at risk of disease by releasing pet colonies. We are responsible to give our pets the best care we can manage for the rest of their lives.

That doesn't matter they have a built-in hibernation timer, so they will go into winter slumber no matter if it's hot or cold. Also Messor species are VERY sensitive to vibrations, they need a calm place and a month or two without any disturbance.

"We should respect all forms of consciousness. The body is just a vessel, a mere hull."